# 循环小练习
import turtle

t = turtle.Pen()
color_list01 = ["blue", "green"]
color_list02 = ["red", "skyblue"]

for i in range(10):
    t.pencolor(color_list01[i % 2])
    t.circle(10)
    t.left(360/10)
for i in range(20):
    t.pencolor(color_list02[i % 2])
    t.circle(20)
    t.left(360/20)

turtle.mainloop();
